Non-Aqueous Electrolyte Solution for Lithium Secondary Battery and Lithium Secondary Battery Including the Same
A non-aqueous electrolyte solution according to an embodiment of the present invention includes a non-aqueous organic solvent, a lithium salt, an additive including a first additive that includes a phosphorus-fluorine compound, and an auxiliary additive including a carbonate-based compound. A content of the first additive relative to a weight of the carbonate-based compound is in a range from 40 wt% to 110 wt%.
1 . A non-aqueous electrolyte solution, comprising:
a non-aqueous organic solvent;
a lithium salt;
an additive comprising a first additive that includes a phosphorus-fluorine compound; and
an auxiliary additive comprising a carbonate-based compound,
wherein a content of the first additive relative to a weight of the carbonate-based compound is in a range from 40 wt% to 110 wt%.
2 . The non-aqueous electrolyte solution according to claim 1 , wherein a content of the first additive is in a range from 0.3 wt% to 1.2 wt% based on a total weight of the non-aqueous electrolyte solution.
3 . The non-aqueous electrolyte solution according to claim 1 , wherein the first additive comprises lithium difluoro bis(oxalato)phosphate.
4 . The non-aqueous electrolyte solution according to claim 1 , wherein the additive further comprises a second additive comprising an amino silane-based compound.
5 . The non-aqueous electrolyte solution according to claim 4 , wherein the second additive comprises 3-(trimethylsilyl)-2-oxazolidinone.
6 . The non-aqueous electrolyte solution according to claim 4 , wherein a content of the second additive relative to a weight of the first additive is in a range from 60 wt% to 140 wt%.
7 . The non-aqueous electrolyte solution according to claim 1 , wherein the auxiliary additive further comprises an alkyl sultone-based compound and an alkenyl sultone-based compound.
8 . The non-aqueous electrolyte solution according to claim 1 , wherein a content of the auxiliary additive is in a range from 1.1 wt% to 3.5 wt% based on a total weight of the non-aqueous electrolyte solution.
9 . The non-aqueous electrolyte solution according to claim 1 , wherein the non-aqueous organic solvent comprises at least one selected from the group consisting of ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC) and diethyl carbonate (DEC).
10 . The non-aqueous electrolyte solution according to claim 1 , wherein the lithium salt comprises at least one of lithium tetrafluoroborate (LiBF 4 ), lithium hexafluorophosphate (LiPF 6 ) and lithium difluorophosphate (LiPO 2 F 2 ).
11 . The non-aqueous electrolyte solution according to claim 1 , wherein the carbonate-based compound comprises at least one of vinylene carbonate (VC), vinylethylene carbonate (VEC) and fluoroethylene carbonate (FEC).
12 . A lithium secondary battery, comprising:
an electrode assembly comprising a cathode and an anode facing the cathode; and
the non-aqueous electrolyte of claim 1 impregnating the electrode assembly.